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Peru has a high productive potential due to ideal climatic conditions and a favorable soil for the cultivation of different agricultural export products, but the phytosanitary problems caused by different pathogens in the different phenological stages of the crop generate significant losses in quality and quantity of product harvested in the field and after harvest. Therefore, this research aimed to measure the effectiveness of chemical products through the poisoned food test. In vitro, seven active ingredients were tested: tiabendazole, azoxystrobin, carbendazim, copper sulfate pentahydrate, copper phosphite, chlorothalonil and extract of Melaleuca alternifolia. For this, the percentage of inhibition of mycelial growth (PIMG) was evaluated. In this in vitro test, 100 % PIMG was obtained for: R. solani with copper sulfate pentahydrate; P. infestans and S. sclerotiorum with azoxystrobin; R. solani, F. oxysporum, L. theobromae, S. sclerotiorum, C. gloeosporoides and Penicillium spp. with carbendazim; F. oxysporum, B. cinerea, L. theobromae, S. sclerotiorum with copper phosphite; R. solani, F. oxysporum, L. theobromae and Penicillium spp. with tiabendazole. The extract of Melaleuca alternifolia had the lowest PIMG for F. oxysporum and R. solani with an inhibition of the pathogen of 69.50 and 64.75 % respectively. [ABSTRACT FROM AUTHOR]